KHAN ET AL (2012), FUUAST J. BIOL., 2(2): 19-24

BIODIVERSITY IN BENTHIC COMMUNITIES OF CHINNA CREEK

MOAZZAM ALI KHAN1, WAFRA MATANAT ZAHEEN2 AND S. SHAHID SHAUKAT1

1Institute of Environmental Studies, University of , Karachi-75270, 2Marine Reference Collection and resource center, , Karachi-5270, Pakistan

Abstract

Chinna creek covers an area of about 6 square Kilometer which extended from Boat Basin to Native Jetty Bridge and joins, Kimari. It is about 5.0 Km long, 300 to 500 m wide with the depth ranges from 1 m to 3 m. The quantitative faunal analysis conducted in this study was performed to determine the abundance and distribution of faunal groups and sub groups. Observations were based on three successive samplings in the year 2006. The individuals found from the study sites belonged to four invertebrate groups i.e. Annelida, Mollusca, Nematoda and Arthropoda. Numbers of individuals of Nematodes (63.62%) were found highest from all the stations followed by Cirripedia (18.71%), Pycnogonida (6.44%), Acarina (6.10), Copepoda (2.36%), Collembola (1.20%), Gastropoda (0.41%), Polychaeta (0.30%), Oligochaeta (0.26%), Coleoptera (0.19%), and Arachnida (0.15%). Remaining collection also included few unidentified specimens and unidentified larval stages. Faunal abundance at Chinna Creek with presence of indicator species in dominance and presence and absence pattern of sensitive, facultative and tolerant groups according to their abilities showed that one possible reason for this pattern of faunal diversity is due to heavy pollution load that is entering in the area.

Introduction

Karachi is situated on the southwestern part of Indus delta. It is the most thickly populated city of Pakistan with a population of over 18 million. Karachi is the biggest hub of industrial activity having more than 8000 industries. Except few well-established industries, which have installed preliminary treatment facilities, all units discharge their wastes directly or indirectly into the Karachi coastal area. (Khan et al., 1999a; ACE, 1993), which is causing deterioration of marine environment (Ahmed, 1995). The coastal zone of Karachi is about 135 km long and is the most affected area along the coast of Pakistan (Khan et al., 1999; Ali, and Jilani, 1995; Beg 1997; Beg, et al., 1984, Haq, 1976). The Karachi harbor is about 62 km stretching from Sands pit to Chinna Creek, The study area Chinna creek is about 5.0 Km long, 300 to 500 m wide with the depth ranges from 1 m to 3 m. It covers an area of about 6 square Kilometer which extended from Boat Basin to Native Jetty Bridge and joins, Kimari. At its northern bank, PNS building Lalazar Bungalows, Boat club, Port house, Naval officers residence, Karachi club and KPT officers society are situated and towards its southern bank Shirin Jinnah colony, Sikandar abad, Majeed colony, Okhai colony are present. Before the construction of Karachi port in 1873 Chinna creek had two entrances one at Manora channel and other at Clifton. When the Clifton entrance was artificially closed for using western break water as an intertidal reservoir, the creek flourished with thick mangrove growth (Khan and Shaukat, 2008) of mostly Avicennia marina. Chinna Creek receives about 16 million gallons of untreated wastewater per day and toxic wastes of Karachi city, through Nehr-e-Khayyam, TPX drain and a drain from Habib Public School. In addition, there is an indirect impact of about 200 mgd of wastewater discharged by Lyari River (Khan et al., 1999; Ali, and Jilani, 1995). These discharges seriously impair the marine ecosystem resulting in the loss of natural flora and fauna that are important for a stable and beneficial ecosystem (Beg, 1995). Mangroves present in the area are under severe stress due to rise in the toxicity level.

Materials and Methods

Samples were collected from five different sites (locations) all along the Chinna Creek extending from Nehar Khayyam (TPX drain) up to Native Jetty Bridge. Sites for sample collections are presented in Table 1 and Fig. 1(a, b).

Processing of samples for the analysis of benthic fauna: Patterson Grab was used for the collection of benthic fauna from the selected sampling sites. A quadrate of 1.0 m2 at each site was placed randomly and the sediment with benthic organisms were collected and transported in the plastic bags. For ensuring an ample fixing of all the material, 10% Formalin was added to the sample. Rose Bengal (1 % solution in distilled water) was also added to the samples for staining the benthic organisms, which made the sorting of faunal groups convenient.

KHAN ET AL (2012), FUUAST J. BIOL., 2(2): 19-24 20

Sieving and Sorting: In laboratory, each plastic bag containing biotic sample was carefully opened and the content was put on a sieve of 0.5 mm mesh. The bottom of the sieve was gently dipped several times in a sink containing water. The sediment remained on the sieve was transferred to glass Petri plates and the benthic organisms were handpicked, mostly under a stereomicroscope. Care was taken to pick up all the organisms present in the sediment sample. These organisms were put in suitable containers and fresh formalin solution (10%) was added. The containers were properly labeled.

Counting of the biota: Individual organisms were counted carefully, either with naked eyes or under a stereomicroscope. Where an organism was not intact, care was taken not to count different parts of the body as separate individuals.

Identification of biota: In present study due to complex nature of the invertebrate taxonomy, lacking of expert opinion and missing of species specific characters in preserved specimen, identification of invertebrate fauna was done up to group level only (except few groups where species specific characteristics and expert opinion was available.) Temporary slides of microscopic organisms were made in glycerol jelly, which is a mixture of gelatin (10g), distilled water (60ml), glycerol (70ml) and phenol (0.25g) (Peacock 1966).Lactophenol (Amann’s Medium) was used to clear the specimens, especially nematodes and polychaets. The lactophenol was prepared by adding 20 g of phenol to 20 ml of distilled water, when the phenol dissolved completely, 16.8 ml of lactic acid (glacial) was mixed and finally 33.3 ml of glycerol was added (Peacock 1966). The references which were used for the identification of biota include: Wesenberg-Lund (1949), Dance (1974), Oliver (1975), Bemert and Ormond (1982), Burukovskii (1982), Tirmizi and Zehra (1984), Davaney et al. (1987), Campbell (1989), Fish and Fish (1989), Allen (1997), Mustaquim (1997) and Shameel (2001).

Measurement of Diversity: The general taxa diversity (H) was measured by the popular Shannon-Weiner index (Magurran, 1988). The general diversity was decomposed into its two components, i.e.,: richness (d) and equitablity (J). Richness was assessed using Menhinick index and equitability by Pielou’s index (Pielou, 1977; Ahmed and Shaukat, 2012). The variances of diversity and equitability were also determined. Dominance was estimated using Simpson’s index (D).

Fig.1. Sites of sample collection

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Table 1. Sampling Sites with their Geographic Coordinates

S. No. Sampling Stations Adjacent to Sampling sites coordinates 1 S-1 TPX drain 24o 50' 17'' N 67 o 0' 24'' E (Beach Luxury hotel) 2 S-2 Karachi Club 24 o 50' 33'' N 66 o 59' 43'' E 3 S-3 KPT Mehran II 24 o 50' 35'' N 66 o 59' 39'' E 4 S-4 Habib public School nullah 24 o 50' 26'' N 67 o 0' 1'' E 5 S-5 Near Mangroves 24 o 50' 26'' N 67 o 0' 1'' E

Results and Discussion

The quantitative faunal analysis conducted in this study was performed to determine the abundance and distribution of faunal groups and sub groups. Observations were based on three successive samplings in the year 2006. The results are reported in. Table- 2.

Table 2. Frequency of occurrence of invertebrate groups collected from Chinna Creek

Sampling sites Number Major Group/Taxa of % S-1 S-2 S-3 S-4 S-5 Ranking Individual Abundance s Annelida Polychaeta 6 1 1 8 0.30 8 Oligochaeta (Earthworm) 1 6 7 0.26 9 Mollusca Gastropoda 1 10 11 0.41 7 Bivalves Nematoda 174 466 484 300 276 1700 63.62 1 Arthropoda Crustacea Maxillopoda Cirripedia 500 500 18.71 2 Copepoda 14 41 5 3 63 2.36 5 Ostracoda Malacostraca (shrimps, crabs) Decapoda complete Uniramia Hexapoda Collembola (Spring tail) 3 5 1 11 12 32 1.20 6 Coleoptera (Beetles) 2 2 1 5 0.19 10 Chelicerata Acarina (Ticks & Mites) 2 159 2 163 6.10 4 Arachnida 1 2 1 4 0.15 (pseudoscorpion, spiders) 11 Pycnogonida Sea spider 10 2 159 1 172 6.44 (limpura) 3 Unidentified specimen 1 1 1 3 0.11 12 Unidentified Larval stages 1 1 0.04 13 Unidentified moults. Total 210 527 1309 322 304 2672

Faunal distribution is categorized into four groups on the basis of abundance at different stations of the study area (Ahmed, et al., 1982). There were some groups which were found abundantly in all samples they are marked as Group 1. There were some groups which were found fairly abundantly and characterized in Group 2, while some organisms were found in less numbers in few samples they were placed in Group 3. While few were found once or twice in number in one or two samples which belongs to Group 4. KHAN ET AL (2012), FUUAST J. BIOL., 2(2): 19-24 22

In present study, total 2672 numbers of complete individuals were found along with 2,045 numbers of fragmented specimens at all the stations of Chinna Creek. The individuals found from the study sites belonged to four invertebrate groups i.e. Annelida, Mollusca, Nematoda and Arthropoda. Numbers of individuals of Nematodes (63.62%) were found in highest quantity from all the stations followed by Cirripedia (18.71%), Pycnogonida (6.44%), Acarina (6.10), Copepoda (2.36%), Collembola (1.20%), Gastropoda (0.41%), Polychaeta (0.30%), Oligochaeta (0.26%), Coleoptera (0.19%), and Arachnida (0.15%). Remaining collection also included few unidentified specimens and unidentified larval stages.

Table 3. Diversity and dominance measures and their variances calculated for the five sampling sites and for the overall sample.

Diversity index Site 1 Site 2 Site 3 Site 4 Site 5 Overall Taxa diversity H 0.7312 0.4828 1.279 0.307 0.465 1.177 Var (H) 0.0079 0.0023 0.0003 0.0024 0.0047 0.0005 Equitability J 0.3175 0.232 0.657 0.2214 0.2039 0.459 Var (J) 0.0015 0.0005 0.00007 0.001 0.0009 0.00007 Richness d 0.691 0.352 0.193 0.223 0.5735 0.251 Simpson’s 0.6989 0.790 0.311 0.869 0.8258 0.449 dominance D

Taxa diversity and dominance are reported in Table 3. Site 3 showed the highest taxa diversity (H) while site 4 exhibited the lowest taxa diversity. .Equitability (J) was lowest for site 5 and highest for site 3. Diversity (h) and equitability (J) showed an inverse relationship. Likewise, dominance showed inverse trend with taxa diversity. Species richness was highest for site 1. On an overall basis both diversity and equitability were low considering that a number of taxa were included in the sample. Although, the creek area is a part of Manora channel but in present study a very limited biodiversity is being observed from the creek area which is paradoxical with the previous studies related to Karachi coast Tirmizi and Barkati (1983), Tirmizi et al. (1986), Barkati and Tirmizi (1988), Ahmed (1988), Karim (1988), Ayub (1989), Naeem (1993), Zehra et al. (1996), Saleem et al. (1999), Qureshi and Sultana (2000), Ghani and Nawaz (2000), Kazmi et al. (2000), Maqbool and Kazi (2000), Khan and Khan, (2001), Ghory and Siddiqui (2002), Kazmi et al. (2004), Barkati and Rahman (2005), Farooq (2006), Ghory and Siddiqui (2006), Ghory and Siddiqui (2007). According to Walker et al. (2001, cited in Cunha, et al., 2006) pollutant affect ecosystem, in three different ways. i) It turns down number of individual as much as they become extinct. ii) Achievement of new equilibrium level so that the population can survive in contaminated environment. iii) Development of resistance in benthic population against pollution which results in increase in size and reached at equilibrium level. The reduced biodiversity is mainly due to indiscriminate discharge of untreated domestic and industrial effluents into the creek area.

Conclusion: The above study clearly demonstrates that the creek is gravely polluted with variety of toxic pollutants of domestic and industrial origin that are toxic to marine life. It is imperative that the city administrative authorities strictly control the dispersal of waste into the creek area so that the creek may appears into its natural pristine form.

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